Answer:

COPERNICUS

Answer	Crossword Clue
COPERNICUS	Astronomer who claimed the Earth orbited the Sun
COPERNICUS	Prominent lunar crater
COPERNICUS	Father of Modern Astronomy

COPERNICUS	Pioneer in astronomy, c. 1530.
COPERNICUS	Astronomy's father
COPERNICUS	Astronomer born in Torun, Poland
COPERNICUS	He placed the sun at the center of the universe
COPERNICUS	Pioneer in heliocentric theory